Just thinking out aloud here - but as far as I can tell there's nothing to stop you going for your IR before your CPL? Is there?
Assuming you got that, that'd knock 10 hrs off your CPL course too.
If after doing that you were still short of hours - you'd be able to get them in what would be marginal weather for a bog-standard PPL, hopefully without much difficulty.
Unless I'm missing something blindingly obvious?